Electrophysiology of the intention to speak
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1
Goethe University, Germany
What happens when we prepare to move? The initial intention to move reflects cognitive processing prior to motor preparation and can be isolated by the use of cue-target paradigms. In speech production, this corresponds to the intention to speak (cue-related activity) compared to speech planning and execution (target-related activity). While motor preparation is believed to be reflected in the Bereitschaftspotential or contingent negative variation, electrophysiological correlates of intention-related processing are not known. We thus performed a speech production MEG study on 25 healthy participants. Subjects were informed with two different cues whether a sentence presented 2 or 4 seconds later was to be read out loud or silently. We analyzed only cue-related activity prior to target presentation using FieldTrip and SPM8. Presentation of the cue elicited temporal stimulus anticipation by phase-locking of a delta rhythm to increase excitability at the moment of target presentation (Lakatos et al., 2007). This temporal prediction was paralleled by sustained gamma band activity potentially related to the coding of task rules. Following the Event-related potential component, beta band activity diminished and stayed suppressed until target presentation. This suggests that beta-desynchronization in motor cortex takes place prior to motor planning indicating that the status quo of the motor system is already altered by cognitive processes. Consequently, intention to speak may involve integration of motor cortex in a speech production network (Kell et al., 2011).
Keywords:
Cognition,
MEG
Conference:
XI International Conference on Cognitive Neuroscience (ICON XI), Palma, Mallorca, Spain, 25 Sep - 29 Sep, 2011.
Presentation Type:
Poster Presentation
Topic:
Poster Sessions: Neurophysiology of Cognition and Attention
Citation:
Gehrig
J,
Wibral
M and
Kell
CA
(2011). Electrophysiology of the intention to speak.
Conference Abstract:
XI International Conference on Cognitive Neuroscience (ICON XI).
doi: 10.3389/conf.fnhum.2011.207.00306
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Received:
22 Nov 2011;
Published Online:
28 Nov 2011.
*
Correspondence:
Dr. Johannes Gehrig, Goethe University, Frankfurt, Germany, jgehrig@med.uni-frankfurt.de